Presser-finger-operating mechanism for embroidering-machines.



R. ZAHN, DECD.

A. RIETZSCH. ADMINISTRATOR. PBESSER FINGER OPERATING MECHANISM FOR EMBROIDERING MACHINES.

APPLICATION FILED FEB. 9, 1914.

' Patented Oct. 26, 1915.

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ROBERT ZAHN, DECEASED, BY ALFRED RIETZSCH, ADMINISTRATOR, OF PLAUEN, GERMANY.

PBESSER-FINGER-OPERATING MECHANISM FOR EMBROIDERING-MACHINES.

Specification of Letters Patent.

Patented @ct. 26, 1915.

Application filed. February 9, 1914. Serial No. 817,499.

To all whom it may concern:

Be it known that T, ALFRED Rintrzsori, a subject of the German Emperor, residing at Plauen, Germany, am administrator of the estate of ROBERT ZAHN, deceased, who was a subject of the German Emperor, and that said ROBERT ZAHN did invent the new and useful Improvement in Presser-Finger-Opcrating Mechanism for Embroidering-Machines, of which the annexed is a specification.

In embroiderin machines the presser fingers are fastened to a common rock shaft, which. is rocked to and fro by means of lever arms. Hitherto such lever arms have been fastened to the ends or the middle of the shaft. Now such arrangement is quite efficient, as long as the machines and shafts are comparatively short, so that the torsional force on the shafts will have little effect on the operation of the presser fingers. But as the machines increase in length, as with the modern type of embroidering machines which reach the length of about 15 yards, the pressure exerted by the presser feet against the fabric is no more uniform and a perfect working of the machine is impossible, unless the shaft is proportionately increased in thickness, which, of course, is objectionable.

To obviate this evil is the object ofthe present invention, which I accomplish by providing the presser foot shaft at short intervals with a great number of spring actuated levers adapted to be operated each by a separate lifting mechanism, all of which are controlled from a common actuating mechanism.

To make my invention more clear, the same is illustrated in the accompanying drawing, in which similar reference characters denote corresponding parts and in which Figure 1 is a front elevation of the presser foot operating mechanism; Fig. 2 is a plan View and Fig. 3 a vertical cross section thereof.

To the rock shaft 1 are fixed in well known manner the presser feet'2 which during the operation of the machine are adapted to be rocked toward and away from the fabric. The shaft 1 is provided with a plurality of levers 3 arranged at short intervals, such levers being fixed to the shaft 1 and being actuated by springs 4 which with one end frame and with the other end to the end 3 of the levers 8. These springs tend to swing the arms 3 away from the fabric, thereby rocking the shaft 1 in anti-clockwise direction and pressing the presser feet 2 against the fabric 5-5 (Fig. 3). Owing to the plurality of levers the torsional force is uniformly distributed throughout its length. Cooperating with each lever 3 is a mechanlsm, whereby the presser finger operating shaft 1 is rocked in clockwise direction against the tension of the springs 4:.

In the present embodiment of my invention, I have shown this lifting mechanism to consist of a horizontally disposed push rod or plunger 7 arranged opposite each lever arm 3 and slidably guided through a stationary part 6 of the machine frame.

It will be seen that when the push rod or plunger 7 is moved toward the arm 3 it will swing the latter against the tension of the sprlng 4 toward the plane of the fabric 55, thereby rocking the shaft 1 in clockwise direction and move the presser fingers 2 away from the fabric.

The actuating mechanism for the plungers 7 consists of a rod 8 arranged parallel to the presser finger shaft 1 and engaging an arm of each of a plurality of bell crank levers 9 fulcrumed at the points 9 to a stationary part of the frame. The other arms of the bell cranks 9 are adapted each to project in the path of a plunger or push rod 7, so that when the rod 8 is moved in the direction of the arrow (Fig. 2) the bell cranks 9 will simultaneously engage all the push rods or plungers 7 and move the same toward the corresponding arms 3 to actuate the same in the aforedescribed manner.

The actuating rod 8 may be operated either manually or automatically in any desired and well known manner. Owing to this structure, the shaft 1 can be made of small diameter notwithstanding the great length thereof without afiecting the operation of the presser fingers.

Having described the nature of my invention, I do not wish it to be understood as limiting myself to the details of the construction described and shown, since various changes may be made therein without departing from the spirit of my invention.

What I claim and desire to secure by Letters Patent is:

In an embroidering machine, the combi-' nation With presser feet and a common operating shaft therefor, of a plurality of levers fixed at short intervals to said shaft, a spring for each lever adapted to normally press the presser feet into Working position horizontally movable push members, one for each of said arms, a plurality of rocking members, one for and in the range of each push member and a common operating means for said rocking members, the latter Copies of this patent may be obtained for being adapted to, in each cycle of the machine, act against the corresponding push member to move the presser feet out of Working position.

In testimony whereof I affix my signature in presence of two Witnesses.

ALFRED RIETZSCH, Administrator of Robert Zalm, deceased.

Witnesses:-

Josnr GRONNY, ROBERT H. NIER.

five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

